PCB with Impedance Control

The importance of controlled impedance in a printed circuit board can depend on many variables, including the PCB’s unique characteristics and how the board will be used.

To understand the importance of precision when it comes to impedance requirements, let’s take a look at some of the specifics involved.

Impedance is the sum of the resistance and reactance of an electrical circuit; it is measured in Ohms. Impedance is an alternating current characteristic in which signal frequency is an important element. The longer the trace or the higher the frequency, the more imperative it becomes to control the trace impedance. Signal frequency is a vital factor for traces which connect to components requiring two to three hundred MHz or more.

Many different trace configurations can be used in printed circuit boards to achieve controlled impedance. A PCB manufacturer can control the impedance through spacing and dimensions of the circuit board traces.

Printed circuit boards with controlled impedance require a meticulous level of accuracy in order to function correctly. PCB designers specify trace impedance and tolerance required, and work with the PCB manufacturer to confirm that specifications are met.

At EPCB, we source our rigid, and rigid-flexible printed circuit boards from the top PCB manufacturers to ensure that our customers receive only the highest-quality printed circuit boards that meet all impedance specifications.